AWS Transform Custom Automates Java Modernization

This post describes AWS Transform custom, an agentic-AI service that automates large-scale Java application modernization with AWS-managed and user-defined transformations. It demonstrates migrating a Gradle Spring Boot Movie Service from Java 8 to Java 21 using the ATX CLI, configuration files, and interactive or direct execution modes. The article outlines transformation planning, validation steps, and Git workflow integration for repeatable upgrades.